package com.ruben.dao;


import org.apache.ibatis.type.BaseTypeHandler;
import org.apache.ibatis.type.JdbcType;
import org.apache.ibatis.type.MappedJdbcTypes;

import java.io.ByteArrayInputStream;
import java.io.UnsupportedEncodingException;
import java.sql.*;

/**
 * className:ConvertBlobTypeHandler
 * <p>
 * 自定义typehandler，解决mybatis存储blob字段后，出现乱码的问题
 * 配置mapper.xml：
 * <result  typeHandler="cn.ffcs.drive.common.util.ConvertBlobTypeHandler"/>
 *
 * @author lgf
 * @version 1.0.0
 * @date 2016-05-05 11:15:23
 */
@MappedJdbcTypes(JdbcType.BLOB)
public class ConvertBlobTypeHandler extends BaseTypeHandler<String> {//指定字符集
    private static final String DEFAULT_CHARSET = "utf-8";

    @Override
    public void setNonNullParameter(PreparedStatement ps, int i,
                                    String parameter, JdbcType jdbcType) throws SQLException {
        ByteArrayInputStream bis;
        try {
            bis = new ByteArrayInputStream(parameter.getBytes(DEFAULT_CHARSET));
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException("Blob Encoding Error!");
        }
        ps.setBinaryStream(i, bis, parameter.getBytes().length);
    }

    @Override
    public String getNullableResult(ResultSet rs, String columnName)
            throws SQLException {
        Blob blob = rs.getBlob(columnName);
        byte[] returnValue = null;
        if (null != blob) {
            returnValue = blob.getBytes(1, (int) blob.length());
            try {
                return new String(returnValue, DEFAULT_CHARSET);
            } catch (UnsupportedEncodingException e) {
                throw new RuntimeException("Blob Encoding Error!");
            }
        } else {
            return "";
        }

    }

    @Override
    public String getNullableResult(CallableStatement cs, int columnIndex)
            throws SQLException {
        Blob blob = cs.getBlob(columnIndex);
        byte[] returnValue = null;
        if (null != blob) {
            returnValue = blob.getBytes(1, (int) blob.length());
            try {
                return new String(returnValue, DEFAULT_CHARSET);
            } catch (UnsupportedEncodingException e) {
                throw new RuntimeException("Blob Encoding Error!");
            }
        } else {
            return "";
        }

    }

    @Override
    public String getNullableResult(ResultSet arg0, int arg1) throws SQLException {
        // TODO Auto-generated method stub
        return null;
    }
}
